How to pronounce “pliocene” in English

Pliocene formations, Miocene formations, there's no method that will allow you to directly date the bone.

in layers of rock from the early Pliocene Period, or middle Pliocene Period.

Now, the layers that he considered Pliocene are considered to be Eocene.

He would have said, these layers are from the Pliocene Period, which is an old geological period.